Belt-tightener.



B. M. W. HANSON.

BELT TIGHTBNER. APPLICATION FILED JUNE 2, 190a;

Patented Dec. i, 1908. I

Wfiazzsan By I is Attorneys, a; I

Wtlzsses wimp/a ing the tension nece v UNITED STATES PATENT OFFICE.

BENGT M. W. HANSON, OF HARTFORD, CONNEGIICUT-,, ASIGNOR TOPRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT A C0RPORATION 0 NEWFJERSEYU BELT-TIGHTENER.

I No. 905,526.

Specification of Letters Patent Patented Dec. 1, 1908.-

Application fi led. June 2; 1908. Serial-No. 436,203.

To all whom it may concern:

sox, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful. Improvements in Belt-Tight eners, of which the following is a specification.

This invention relates to belt-tighteners the object of the invention being-to provide a simple article of this character. for apply to a driving-belt to remove slack therefrom.

The device maybe used with advantage ininany different connectionsalthough it is of particular utility when employed in conjunction with or as part of anorganized grinding or similar metal-working machine where its compact form, simplicity .and effectiveness are desirable attributes.

In the drawings accompanying and foTning partof this specification I illustrate in detail one convenlent form of embodiment of the invention which to enable those skilled in the art to practice the same will be; set

forth at length in the following (lGSCIiPtZlOlly while the novelty of the invention willbe included in the claims succeeding saiddeseription. From the statement just made it will be obvious that I do 'not restrict myself to the showing made by said description and drawings for certain variations may' be adopted within the scope of my claims.

Referring to said drawings, Figure 1 is atop, .plan view of a belt-shifter including my invention and showing also the slide of a" grinding machine on which sald belt shifter is mounted, and, Fig; 2 is aside elevation of the parts illustrated. in the preced ng figure,

the belt forsake of clearness being omitted in the first-mentioned figure.

Like characters refer to like figures. a

In the drawings the numeral 5 represents parts in both a slide which is common in certain class s of grinding and analogous machines anl which constitutes the base or bed of framing which sustains the belt-tightening mechan- From one end or it may be asideof said slide, a pair of standards as 6 is shown as. rising, sa d standards terminating at their upper ends in wh ch re .ceive for rotary motion a primary shaft as elongated bearings or hubs as 8. Said. shaft is a primary one so far as the I -tool=sliaft or spindle, hereinafter described Be it known that I, Bnx'or M. WV. H-\X' chine such as that to which allusion has been made, constitutes the tool-spindle. Said shaftll is shown as provided with, a tool as 12 at one end thereof in the form of the well known gl'llldlllg-(llSk;

The shaft or toolsuitably fastened thereto bei and between the bearings a driven member as 13 which is represented as consisting of aperipherally grooved pulley.

The primary or main shaft 8 is shown as provided withgadriving member as 14, fas-.

spindle 11 has tween its ends 'tened thereto in any desirable way and lo 'cated between the hul or bearings 7. The driving member 11 also consists of a pulley; it is shown as being peripherally plain and as of greater dameter than the pulley 13 by virtue of which latter fact the tool can be driven at a high speed.

The belt-tigitener involves in its make-up preferably an oscillatory arm or rocker and one such as that denoted in a general way by lfi subse'rves satisfactorily my purpose. The rocker or oscillatory arm is illustrated as being substantially flat and as composed of two relatively-elongated, side branches disposed in parallelism and a cross -piece 1G connecting said side arms; and I ay inexpensively and strdngly produce sziilsa'ocker by casting. The arallel side bra ches of the rocke'f'lti sup ortattheir foi ward or inner ends a sha t as 11 which arries a rotary idler or bet-tighteningpull y as 18 underwhich the upper run of a belt as 19 is shown as passing the ends of the belt being looped arou d the pulleys 13 and 14 'thelatjter of L-xvhic is located between the side branches of the rocker or arm 15. The

shaft 17 as-well as'the'hrOsS-piece 16 serves as a transverse strut or -brac'e for the rocker 15.- The rear oron'ter ends of the rocker 15 are shown'as ivoted as at 20 to lugs 21 on the hubs or bearin s17, the In s or 'ears 21 1 extending inwardly or rforward vy. The outer end of the rocker 15 is shown as pivoted between these ltigsto further strengthen the structure. a a p I do not rely upon gravity or-the weight to the idle run of tbe belt 19 to eliminateof the reeker 15 to apply the necessery'st-ress sleek lzlierein but, as will hereinafter spew, provlcle posibu e means forthis purpose. ,1 usexthe term ldle est-applied to the upper pen of the bell; to distinguish it] from the lower or orking run thereof, said lower run doing} elgerns iorpart' of the power-transmi'lting eperationi By having the tokeup pulley eel; against the idle run the working run is notintertfered. with and I can there fore obtsiz'r from the orking run the maximum (lraft or pulling efieet and this withoutloading the orkln run.

On one of the si e branches of the rocker 3.5 or that shown'in' the foreground in Fig. 52 I may forms leg oreares 23 illustrated.

.esbeing in the plane of; the body of? said rocker and I have illustrated as tapped through this lug from above an adjusting or thmnb'sc1ew as 24L to which 15' shown as connected. the upper end ofa pull spring es 25, the lower end of said spring being s neeblyconnectecl with the slide 5. "Seidspring exerts a conszzml; downward pull on the rocker: 15 to tliororighly remove slack in the belt 1%. The 423381011 of the spring can be readily: regulated-by the screw 24 One of the branches of the rocker. 15 (orif neceseel-y both of said; branches) may be provided with a tee as 26 censfiituting conseems venient stop and which when the belt 19 is removed abuts against an adjacent standard 6 on-the descent of the rocker 15 to prevent the pulley 18 moving all the Way to the slide 5 et-jsuch time.

Having described the invention,'what I claim is:

1. The combination of o pair of pulleys;

a substantially fiat rocker having connecte sidebrsnches between which one of said branches being ivotecl to the standard at opposite sides ohsaid pulley to receivesaid pulley betweensaid branches, and an ldler pulley retatively supported by and between said branches attheir opposite ends.

In, testimony whereof I affix my signature in presence of two Witnesses.

senor M. W. ANSON; Witnesses: v i I W. M." S'ronRs,

=H. W. KILBOURNE. 

